Thanks!
So I understand what I'm looking at, these are the specs for modifying a standard upper for an AR47 build?
I was under the impression AR47 builds used standard lowers with stanag-compatible magazine. If so, why would there be a requirement to modify the upper?
Bringing this back from the dead.
Stumbled across this thread from a google search, best and most relevant content I could find on the KS47.
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Just picked up a KS47 Gen 2 lower with a BCA reciprocating side charging upper. Previous owner was strapped for cash and...